Holder for die grinding



Oct. 25, 1949. v F. CRQNLUND 2,485,866

HOLDER FOR DIE GRINDING v Filed Jan. 1 4, 1948 IN VEN TOR.

4X51 g: CPG/VLU/VU,

Patented Oct. 25, 1949 UNITED STATES PATENT OFFICE HOLDER FOR DIEGRINDING Axel F. Cronlund, Joliet, in. Application January 14, 1948,Serial No. 2,251

1 This invention relates to a die holder and more particularly to aholder for positioning a wire drawing die in a grinding or lappingmachine.

Heretofore, when it became necessary to grind a wire drawing die, thedie was placed in a cylindrical cup and fixed in position with setscrews that extended through threaded openings in the sides of the cup.The cup holding the fixed die was then placed upon the work platform ofthe grinding machine, the revolving grinding pin was brought intoengagement with the die and a liquid solution of an abrasive insuspension allowed to flow thereover. "When the grinding operation wascompleted, the die was removed from the cylindrical cup by hand andwashed in a solvent oil to remove the adhering abrasive particles.

One of the shortcomings of this method was the time consuming operationinvolved in manipulating the set screws to position and firmly fix thedie within the cylindrical cup preparatory to grinding and in removingthe die after grinding was completed.

Another serious disadvantage inherent in this method was the need forthe operator to handle the die with his bare fingers after the grindingoperation and also after the solvent rinse, thereby subjecting'his skinto the deleterious effects of the abrasive solution and the solvent oil.It has been found that the abrasive solutions and the oil solventscommonly used in this type of operation are irritating to the human skinand contact with them frequently causes infection or other skinafliictions.

It is an object of my invention to provide a die holder which will holda die securely in the correct position during a grinding or lappingoperation.

Another object of my invention is to provide such a die holder whichallows the die to be inserted or removed expeditiously by means of atool, thereby eliminating the need for the operator to expose his skinto the harmful effects of the materials used in die grinding andcleaning operations.

It is still another object of my invention to provide such a die holderthat is simple and rugged in construction and inexpensive tomanufacture.

These and other objects will become more apparent after referring to thefollowing specification and attached drawing, in which:

Figure 1 is a perspective view, with parts broken away, showing a wiredrawing die positioned within the die holder of my invention; and

Figure 2 is a cross-sectional view showing the 2 Claims. (Cl. 51-217)details of .the retension means of the invention.

Referring more particularly to the drawing, reference numeral 2indicates a cup-shaped cylindrical case in which is removably fitted abase plate I having a central opening 6 therethrough. The sides of case2 project upwardly from the base plate I so as to confine the grindingcompound to the surface of the base plate and prevent it from splashingover the outer edges thereof. A shoe 8 is mounted on the projecting endof each of four compression springs ID. The die contacting surfaces ofthe shoes 8 are shaped to fit against the outer surface of a die l2;Each of the springs l0 project into the opening 6 from a radial hole llwhich is threaded internally and extends horizontally through the basemember 4. An adjusting screw I6 is screwed into the outer end of eachhole i l. The shaft of screw 16 is provided with a reduced end portionl8 which projects from the hole id in the direction of the shoe 8 and issurrounded by the spring Ill The abutment on the shaft of screw It atthe base of the reduced portion forms a bearing surface for Inoperation, the die [2 is placed in the central opening 6 and the shoes 8brought in contact with the outer side surface of die I2 by turning theadjusting screw l6 of each of the spring members Ill until the die I2 ispositioned firmly and held';

in position in the center of central opening 6 by means of thecompressive force exerted by the contacting shoes 8. The plate member 4,so prepared, is then inserted into the case 2 which, in turn, is mountedon the platform of, the lap ping or grinding machine andoperationscompleted in the usual manner. The abrasive solution usedduring the operation drains through holes 20 and the holes provided'atthe bottom of the case 2. After the grinding or lappingoperation hasbeen completed, the operator may then remove the die from the centralopening 6 by inserting the prongs of a pair of forceps, tongs or similartool in the openings between shoes 8;to grip the die l2 and lift it out.If desi'rable,, the,

die may be allowed to remain in the, die holderand the entire holderimmersed in a solvent oil to been shown and described, it will beapparent that other adaptations and modifications may be made withoutdeparting from the scope of the following claims:

I claim:

1. A die holder comprising a cup-shaped cas ing, a base plate having acentral opening therethrough, the sides of said casing projecting up- 1wardly from said base plate, the peripheral surface of said base platebeing in slidable contact with the inner wall of said casing so that thebase plate can be readily removed from the casing, said base platehaving at least one vertical drain hole therethrough, said base platehaving a plurality of spaced-apart, internally threaded, radial holestherein extending horizontally from its outer side to said centralopening, a compression spring in each of said horizontal holesprojecting therefrom into said central opening, a shoe mounted on theprojecting end of each of said springs, said shoes being shaped to fitagainst the outside surface of the die, and an adjusting screw threadedinto the outside end of each of said horizontal holes and ing having anopen upper end, a base plate having a central opening therethrough, theperipheral surface of said base plate being in slidable con- '4 tactwith the inner wall of said casing so that the base plate can be readilyremoved from the casing, the sides of said casing projecting upwardlyfrom said base plate, said base plate having at least one vertical-holetherethrough, said base plate having a plurality of spaced-apart.

rn y threaded, radial holes therein extend ing l emfits outer; side tosaid cen REFERENCES SPEED The following references are of record in thefile of this patent:

UNITED STATES PATENTS

